[SI-LIST] Re: Question about the Equation in Handbook of Black Magic
- From: "Peter Zhu" <peter.zhu@xxxxxxxxxx>
- To: "ray jiang" <jlray2000@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 20 Apr 2005 09:57:20 +0800
Ray:
The 4.53 is the reflection at the terminal, so it is (Zl-Z0)/(Zl+Z0),
WHY?
Why do you think (Zl-Z0)/(Zl+Z0) has been reflect back to source?
Thanks
Peter
-----Original Message-----
From: ray jiang [mailto:jlray2000@xxxxxxxxx]=20
Sent: Wednesday, April 20, 2005 12:26 AM
To: Peter Zhu; si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Question about the Equation in Handbook of Black
Magic
Peter,=20
I have some idea on this question. The 4.53 is the reflection at
the terminal, so it is (Zl-Z0)/(Zl+Z0). The deduce can be found in any
books about transmition line theroy. As 4.52, i agree with you that it
is the fraction of propagating signal that is absorbed by the load,
which should be 1-R2(w) =3D 2Z0/(Zl+Z0). If this deduce is right, i
think the book has made a mistake.
Best Regards,
Ray Jiang
On 4/19/05, Peter Zhu <peter.zhu@xxxxxxxxxx> wrote:
> All:
>=20
> One question in Dr. Howard Johnson-High Speed Digital Design:
>=20
> How to understand the Equation 4.52 and 4.53
>=20
> I believe the T(W) is the fraction of propagating signal that is
> absorbed by the load, and the R2(W) is the fraction of propagating
> signal that reflects back toward the source.
>=20
> But where do the two equations come from? How to deduce it? I think
it's
> the base to fully understand the signal reflection.
>=20
> Thanks in advance.
>=20
> Peter
>=20
> UTStarcom
>=20
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